Nano Research

, Volume 4, Issue 7, pp 623–634

Tunable separation of single-walled carbon nanotubes by dual-surfactant density gradient ultracentrifugation

  • Pei Zhao
  • Erik Einarsson
  • Georgia Lagoudas
  • Junichiro Shiomi
  • Shohei Chiashi
  • Shigeo Maruyama
Research Article

DOI: 10.1007/s12274-011-0118-9

Cite this article as:
Zhao, P., Einarsson, E., Lagoudas, G. et al. Nano Res. (2011) 4: 623. doi:10.1007/s12274-011-0118-9

Abstract

We present a systematic study of the effects of surfactants in the separation of single-walled carbon nanotubes (SWNTs) by density gradient ultracentrifugation (DGU). Through analysis of the buoyant densities, layer positions, and optical absorbance spectra of SWNT separation using the bile salt sodium deoxycholate (DOC) and the anionic salt sodium dodecyl sulfate (SDS), we clarify the roles and interactions of these two surfactants in yielding different DGU outcomes. The separation mechanism described here can also help in designing new DGU experiments by qualitatively predicting outcomes of different starting recipes, improving the efficacy of DGU and simplifying post-DGU fractionation.

Keywords

Single-walled carbon nanotubes density gradient ultracentrifugation sodium deoxycholate sodium dodecyl sulfate 

Supplementary material

12274_2011_118_MOESM1_ESM.pdf (891 kb)
Supplementary material, approximately 890 KB.

Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Pei Zhao
    • 1
  • Erik Einarsson
    • 1
    • 2
  • Georgia Lagoudas
    • 3
  • Junichiro Shiomi
    • 1
  • Shohei Chiashi
    • 1
  • Shigeo Maruyama
    • 1
  1. 1.Department of Mechanical EngineeringThe University of TokyoTokyoJapan
  2. 2.Global Center of Excellence for Mechanical Systems InnovationThe University of TokyoTokyoJapan
  3. 3.Department of BioengineeringRice UniversityHoustonUSA